Centrifugal pump.



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No. 676,0!4. Patented lune Il, |901. F. B. WARRING.

CENTRIFUGAL PUMP.

(Application led Aug. 25, 1899.)

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@mi/humo@ 5 wom/woz STATES UNITED PATENT OFFICE.

FRANKLIN ll. WVARRING, OF SAN JOSE, CALIFORNIA.

CENTRIFUGAL PUMP.

SPECIFICATION forming part 0f Letters Patent N 0. 676,014, dated June 11, 1 901. Application tiled August 25, 1899. Serial No. 728,472. (Nomodel.)

To all whom, t may concern:

Beitknown that I, FRANKLIN B. WARRING, a citizen of the United States,residing at San Jose, county of Santa Clara, and State of California,have invented certain new and useful Improvements in Centrifugal Pumps;and I hereby declare the following to be a full, clear, and exactdescription of the same, reference being had to the accompanyingdrawings, forming a part of this specification.

My invention relates to centrifugalpumps having incased impellers and tocertain improvements therein.

My improvements consist in providing the inlet-nozzles of the impellerswith packing and means to adjust the same accessible by removing acovering-plate at the side of the Suction-chamber or around thc drivingshaft or spindle of the pump.

The objects of my invention are to prevent the circulation of Wateraround and past the inlet-nozzles, and thus avoid the loss of powercaused by such circulation, also to increase the efficiency or workingcapacity of such pumps. TotheseendsIconstructcentrifugal pumps asillustrated in the drawings herewith, forming a part of thisspecification.

Figure I is a vertical section through what is called a pit or verticalcentrifugal pump with an inlet at one side of the impeller; and Fig. II,a plan View, partially in section, of the removable top plate and partsconnected therewith.

Similar numerals of reference indicate like parts in both figures of thedrawings.

To illustrate my invention in a case where its use is of mostimportance, I have chosen what is called a vertical or pit pump, such asis commonly operated against high heads and receives the supply-water ontop.

In the present and in all centrifugal pumps having incased impellers andwhen the water-pressure is different within and at the sides of theimpeller there is leakage and circulation of Water around or past theinlet nozzle or nozzles. Such water while offering the same resistanceand consuming the same amount of power as the discharged water remainsin the pump, causing a loss in proportion to volu me or the amount ofleakage around the inlet-nozzles, and as these nozzles soon wear andpermit a large portion of the water to circulate my invention is one ofmuch practical importance, especially in the case of high heads andpressures.

Referring to the drawings, l is the main casing, preferably of voluteform.

2 is the impeller, 3 the driving spindle or shaft, and 4 a removable topor side plate, in this case formed integral with the inletnozzles 5.

7 is the discharge-nozzle, cast integral With the main casing 1.

The impeller 2 is of the ordinary incased type, provided with vanes 8and an inletnozzle 9 for the entering water, as indicated by arrows inFig. I. j

10 is a removable plate, shown in Fig. I on the top and concentric withthe spindle 3 and in Fig. 11(10) at the side of the suctionchamber 12.Either of these arrangements permits free access to the impeller-nozzle9.

Around the inlet-nozzle 9 I provide an annular chamber to receiveelastic packing 13, which may be of any suitable material, preferably ofa fibrous nature, and a movable gland 14, held and adjusted by thescrews 15, as seen in Fig. I. The gland 14 and the screws l5 areaccessible from the top or side, or both, by removing the plate 10,which is made large enough to admit the gland 14, thus giving access tothe suction-chamber 12, so the packing can be adjusted to prevent thepassage of Water around the nozzle 9, but never so close as to causeappreciable resistance or friction on the nozzle 9.

The shaft or spindle 3 is provided with th'e usual packing at 17, andwhen the pumps are set in pits this shaft extends to the top and isthere connected to the driving power in the usual manner.

It will be understood that while I have shown my improvement applied atone side only of the itnpeller 2 itis equallyapplicable on both sideswhen that form of construction is necessary.

Having thus described my invention, its nature, and objects, andillustrated an eX- ample of its application in practice, what I claim asnew, and desire to secure by Letters Patent, is

In a centrifugal puinp,a main casing, an incased impeller therein, ashaft to drive said impeller, a packing-gland for said shaft, an

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inlet-nozzle on said impeller surrounding said shaft, a packing-glandsurrounding said nozzle, a suction-chamber having a fixed inlet,communicating with said nozzle, and a removable plate opposite saidnozzle, closing an opening in said suction-chamber, of the full size ofthe packing-gland surrounding the nozzle, through which said gland maybe adjusted, removed and replaced, substantially as specified.

FRANKLIN B. WARRING. Witnesses:

CHAS. D. BLANEY, EDWARD W. PARSONS.

